Mary Kay Letourneau and her former student discuss their marriage

FILE - In this Feb. 6, 1998, file photo, Mary Kay Letourneau listens to testimony during a court hearing in Seattle. Vili Fualaau, who married Letourneau after she was jailed for raping him, says their relationship hasn't always been good, but they've persevered. Fualaau and Letourneau discussed their lives together with Barbara Walters in an interview that will air on ABC News' "20/20" Friday, April 10, 2015. Letourneau is a former suburban Seattle teacher who became tabloid fodder in the 1990s when she was convicted of raping the then 12-year-old Fualaau. She served a prison sentence and then married him. (AP Photo/Alan Berner, Pool, File)
(The Associated Press)

FILE - In this March 21, 2002, file photo, Vili Fualaau watches as his lawyer speaks during opening arguments in a $1 million lawsuit in Kent, Wash. Fualaau, who married Mary Kay Letourneau after she was jailed for raping him, says their relationship hasn't always been good, but they've persevered. Fualaau and Letourneau discussed their lives together with Barbara Walters in an interview that will air on ABC News' "20/20" Friday, April 10, 2015. Letourneau is a former suburban Seattle teacher who became tabloid fodder in the 1990s when she was convicted of raping the then 12-year-old Fualaau. She served a prison sentence and then married him. (AP Photo/Elaine Thompson, File)
(The Associated Press)

SEATTLE – The man who married his former sixth-grade teacher after she was jailed for raping him says their relationship hasn't always been good, but they've persevered.

Vili Fualaau and Mary Kay Letourneau discussed their lives together with Barbara Walters in an interview that will air on ABC News "20/20" Friday night. Fualaau told Walters that "I don't think there's ever a full 10 good years of marriage. ... But, you know, what matters is how you pull through all the bad times."

Letourneau is a former suburban Seattle teacher who became tabloid fodder in the 1990s when she was convicted of raping the then 12-year-old Fualaau.

She served a prison sentence and then married him. Letourneau is now 51 and Fualaau is 31. They have two teenage daughters.